Measurement of dust conversion factor for the JET carbon divertor phases

J. Likonen (Corresponding Author), J.P. Coad, A. Hakola, J. Karhunen, S. Koivuranta, R. Pitts, A.M. Widdowson, JET contributors

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.
    Original languageEnglish
    Pages (from-to)842-846
    JournalJournal of Nuclear Materials
    Volume463
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

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    tiles
    Dust
    Tile
    Carbon
    dust
    carbon
    flakes
    Film growth
    markers
    Particles (particulate matter)
    Plasmas

    Cite this

    Likonen, J. ; Coad, J.P. ; Hakola, A. ; Karhunen, J. ; Koivuranta, S. ; Pitts, R. ; Widdowson, A.M. ; contributors, JET. / Measurement of dust conversion factor for the JET carbon divertor phases. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 842-846.
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    abstract = "We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10{\%}. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.",
    author = "J. Likonen and J.P. Coad and A. Hakola and J. Karhunen and S. Koivuranta and R. Pitts and A.M. Widdowson and JET contributors",
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    Measurement of dust conversion factor for the JET carbon divertor phases. / Likonen, J. (Corresponding Author); Coad, J.P.; Hakola, A.; Karhunen, J.; Koivuranta, S.; Pitts, R.; Widdowson, A.M.; contributors, JET.

    In: Journal of Nuclear Materials, Vol. 463, 2015, p. 842-846.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Measurement of dust conversion factor for the JET carbon divertor phases

    AU - Likonen, J.

    AU - Coad, J.P.

    AU - Hakola, A.

    AU - Karhunen, J.

    AU - Koivuranta, S.

    AU - Pitts, R.

    AU - Widdowson, A.M.

    AU - contributors, JET

    N1 - Project code: 104445

    PY - 2015

    Y1 - 2015

    N2 - We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.

    AB - We compare the deposition of material on poloidal sets of divertor tiles that had been exposed in JET in 1998-2009 and 1998-2007. Post mortem analyses suggest toroidally integrated deposition being increased by 197.5 cm3 during 2007-2009. The analysis of dust collected from the divertor indicates the amount accumulated during the same period to be 248.4 g. Converting the weight of dust to volume, the fraction of material entering the divertor that was converted to dust and flakes is 43 ± 10%. The size of most dust particles ranged from 10 to 100 lm. The integrated amount of deposition on the ''marker'' tiles exposed in 2007-9 was found to be more than twice the amount expected from film growth on other tiles plus the dust because the plasma responds differently to the new tiles.

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    DO - 10.1016/j.jnucmat.2014.10.066

    M3 - Article

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    SP - 842

    EP - 846

    JO - Journal of Nuclear Materials

    JF - Journal of Nuclear Materials

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